I remember there used to be a folder I could just put fonts in and they I believe this is what you're after. I've always thought it a strange practice.
The viewer will learn how to download, install, and customize fonts inside Adobe Illustrator CS6.
This quick tutorial will walk you through how to download and install on a PC a custom or new font for Adobe. I tried that for an Illustrator file. Locate the folder that contains the fonts you want to install. Thanks for your help. If this question or a similar one is answered twice in this section, please click here to let us know. I thought it was a folder called fonts in the same directory the InDesign document was.